Blind Bolt

A blind bolt is a fastener that can be installed from one side of a panel. It expands behind the panel to hold the joint. It is used where the back of the work cannot be reached.

A blind bolt joins parts where only one side can be reached, such as box sections and closed tubes. It is set from the accessible side and forms its own back fixing as it is tightened. It often takes a washer under the head and is set with a matching tool.

This kind of bolt is usually made in steel. Steel grades give high strength for structural joints. A coating is often added to resist corrosion.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance and a mill test certificate for the steel. On receipt, check the bolt body, the collar and the thread. Confirm the grip range and hole size before installation.